abstract |
The present invention relates to a process for the preparation of compounds having the general formula I: characterized in that it consists in subjecting the ketals having the formula: II to a transcetalization reaction with an alpha-bromoketone having the formula: in the presence of an acid catalyst, at a temperature ranging from 60 to 140 degrees C, and condensing the intermediate product obtained that corresponds to formula IV; with an alkali salt of an azole having the formula V: in a dipolar aprotic solvent, at a temperature ranging from 20 degrees C to the reflux temperature of the reagents. |